Serial RS232 Wireless RF Radio, Economy, 1600 FT[YSC10U]

$49.50

What I can say about this rs232 wireless module is that is it easy to setup and use. Despite its rather light-weight casing it apparently is also reliable. I have been using this with a wireless rs232 water level probe for more than 2 months and it still works fine. Considering the price this module is a good choice for many smaller projects.